.bottom{
    display: block;
    width: 100%;
    height: 28px;
    border-top: 2px solid #c8d1d4;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 12px;
    line-height: 28px;
    color:#acb1b3;
    background: #fff;
    .bottom_focus{
        color:$greenstylecolor;
    }
    bottom:0;position:fixed;
    _bottom:auto;_width:100%;_position:absolute;
    _top:expression(documentElement.scrollTop + documentElement.clientHeight-this.offsetHeight);
}